CVE-2021-3409 Memory corruption in QEMU
A malicious privileged guest can crash the QEMU host or execute code due to ineffective patches for out-of-bounds access in SDHCI emulation.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-3409?
CVE-2021-3409 is a medium-severity memory corruption vulnerability in Debian Debian Linux, published on 23 Mar 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The patch for CVE-2020-17380/CVE-2020-25085 was found to be ineffective, thus making QEMU vulnerable to the out-of-bounds read/write access issues previously found in the SDHCI controller emulation code. This flaw allows a malicious privileged guest to crash the QEMU process on the host, resulting in a denial of service or potential code execution. QEMU up to (including) 5.2.0 is affected by this.
Weakness: CWE-119
Which versions are affected by CVE-2021-3409?
It affects 4 products.
Products include Debian Debian Linux, Fedoraproject Fedora, Qemu Qemu, Redhat Enterprise Linux.
How do I fix CVE-2021-3409?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-3409 being exploited?
There is no known exploitation of CVE-2021-3409 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2021-3409, GHSA-mx4g-vhmg-3rf6, UBUNTU-CVE-2021-3409.